Fall Seasonal Pests in New England

Insects and Rodents Get Ready for Winter—Often Inside Your Home

Fall can be a very busy season for insects, rodents, and other pests but many homeowners don’t realize it.

As the weather cools and daylight shortens, fall becomes one of the busiest seasons for pest activity. Many homeowners underestimate how active insects and rodents remain during this transitional time of year. Pests begin seeking shelter, food, and warmth—and your home becomes the perfect target.

Common Fall Pest Activity

Mosquitoes and Ticks

Despite cooler temperatures, mosquitoes and ticks remain active through October and even into November. These pests can still pose health risks until the first hard frost.

Overwintering Insects

Stink bugs, Asian lady beetles, and boxelder bugs begin trying to enter homes in search of overwintering sites. These pests often slip in through:

Cracks in siding or foundations
Loose screens or attic vents
Openings around utility lines and roof edges

Once inside, they remain dormant until spring—often emerging in large numbers during warm indoor days.

Cluster Flies and Bees

Both may be active during fall, especially in attics or upper levels of the home where warmth rises. They can enter through roof gaps or unscreened vents.

Occasional Invaders

Ladybugs and western conifer seed bugs fall into this category. While not destructive, they often gather in large numbers on siding, windows, and attic spaces.